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Question
1 u or 1 amu (atomic mass unit) is equal to ___.
Options:
A .  (116)th of the mass of an atom of oxygen.
B .  (112)th of the mass of one atom of carbon 12.
C .  12 carbon atoms.
D .  16 oxygen atoms.
Answer: Option B
:
B
Carbon -12 isotope is used as the standard reference for measuring atomic masses.
1 atomic mass unit is a mass unit equal to exactly(112)ththe mass of one atom of carbon 12.

It is expressed as u or amu.

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